KSPConvergedDefaultSetUMIRNorm

makes the default convergence test use min(|| B*(b - A*(initial guess))||,|| B*b ||) In the case of right preconditioner or if KSPSetNormType(ksp,KSP_NORM_UNPRECONDITIONED) is used there is no B in the above formula.

Synopsis

#include "petscksp.h" 
PetscErrorCode KSPConvergedDefaultSetUMIRNorm(KSP ksp)

Collective

Input Parameters

• ksp - iterative context

Options Database Key

• -ksp_converged_use_min_initial_residual_norm - Use minimum of initial residual norm and b for computing relative convergence

Notes

UMIRNorm is short for Use Minimum Initial Residual Norm.

Use KSPSetTolerances() to alter the defaults for rtol, abstol, dtol.

See Also

KSP: Linear System Solvers, KSP, KSPSetConvergenceTest(), KSPSetTolerances(), KSPConvergedSkip(), KSPConvergedReason, KSPGetConvergedReason(), KSPConvergedDefaultSetUIRNorm(), KSPConvergedDefaultSetConvergedMaxits()

Level

intermediate

Location

src/ksp/ksp/interface/iterativ.c

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Index of all KSP routines
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Index of all manual pages